Using the '08 KLR caliper. The KLR uses a 280mm rotor. I'm going to use an '03 SV650 rotor. It's 290mm so I may have to turn a little off the O.D. The offset (none) seems to be right. I found one, it's in the mail.

P.S. Yes I'm going with a single disc. It works on the KLR.

PS - Please define works. Maybe the '08 does but the earlier models - even with the upgraded rotor - is frightening at times.